Internal-combustion engine.



E. OBEREKNSLI.

INTERNAL COMBUSTION ENGINE.

APPLICATION FILED NOV. 28, 1910.

PatentedOdt. 10, 1911.

2 SHEETS-SHEET 1.

F. OBERHKNSLI.

' INTERNAL COMBUSTION ENGINE.

APPLICATION IILED NOV. 28, 1910.

Patented 00111111911.

2 SHEETSSHEET 2.

- Wm. w. w

r-nmnnrcn oiannm'insm, or imnennz, AUSTRIA-Hfi'NGARYL INTERNAL-COMPU'STION ENGINE. I

To all whom it may concern:

Be it known that I, FRIEDRICH O ERHKNSLI, a citizen of- Switzerland, residing at .Bre-

genz, in 'the'Empire of Austria-Hungary,

' chamber.

have invented certain new and useful Improvements in and Relating to Improyements in Internal-Combustion Engines, of which the following is a'specification.

This invention has reference to internal combustion engines of that type provided with compressed airignition and in which theignition period is determined by the'moment at which the oil is injected. This is effected shortly before the engine piston reaches its dead center by the piston of a fuel pump which is operated from the engine. The in jection at the end of the compression permits of a high compression of the mixture without producing premature ignition.

In order to effect a-thorough mixing of the fuel with the air forcombustion, the

I combustion chamber in accordance with the present invention is constructed in such a manner that the fuel issuing from the atomizer nozzle completely fills this chamber.- j The injection of the oil begins at the samemoment of time whilethe actual period of spraying is shortened in proportion as the load'on the engine decreases. The flow of fuel is not interrupted bythe .back stroke of the pump piston but by the opening of an overflow valve so that the in ection of the fuel is caused to cease immediately and with a certainty. The atomizer nozzle which is arranged betweenthe admission and exhaust valves in the-cylinder head. and be neath the pump piston is constructed in such a manner that the issuing fuel forms thorough mixing takes place, so that with in I drawing in which i re 1 1s a vertical section. of the cyl .indq ri a tm valves and the t iz 11oz.

Specification oil Letters Patent. Patented'Oct. 10, 1911. Application filed November '28, 1910 Serial No. 594,558.

zle, and Fig. 2 is a-similar view at ri ht angles to Fig 1, but with pump chamber and fuel nozzle shown in elevation. 7 v

The vertical engine, which, generally speaking, is of ordinary construction, is provided'withan admission valve a and an exhaust valve 6 in the cylinder head. The atomizer nozzle 0 is arranged centrally between these two. valves and loosely mounted therein is an atomizer valve d having its stem projecting into a fuel pump cylinder 6',

which is-provided with a piston e normally held in its upper position by means of a coil spring e On the upper end of the atomizer valve stem is a collar (1 and inter= posed between same and the bottom ofsthe pump cylinder is a coilspring d for normally holding the valve cl against its seat (Z A piece a above the aperture of -thei nozzle 0 forms an abutment for. the valve (1 when in, its lowest position. Arranged laterally of the pump is a suction valve f, and in the cylinder head is an overflow valve 9. Oil is admitted through the pipe which is connected with passage it leadingto the suction valve f from which extends an opening k connnunicating with the top of thepump cylinder. The overflow valve 9 is normally held against its, seat g by means of a coil spring 9' and connected with the top of the pump cylinder e by a channel 21 which extends to the opening 71.. Leading from the overflow valve g. to the oil reservoir is a pipe 70} The suction valve 1 prevents the oil from being forced backward through the passage h during the downward stroke of theipiston e and the escape of the oil in excess from the pump cylinder 1s made throu h the channel 5 and overflow valve 9 to relieve the pressure n thevalved to allow' sameto close quickly. I

oted at Z to a support Z projecting from I the cylinder head androcked by means of the rod m. The operating lever I IS con nected by a with'the regulating lever a which actuate's the overflow valve .9. The

regulating lever .0 is rotatably mounted. on

' anu ad jmtable em iric 3p pmiovidediwith a The pump is operated from the engine by the operatinglever Z which is p1v.-

As soon as the pressure exerts itself toward handle p and mounted on a stud p fixed to the support Z The supply of oil to the engine, the exact movement of the injection and the duration is regulated, according to. thenature of the oil employed, 'by the movement of the pump piston e and the operating of the overflow valve 9, which are con trolled by the adjustment of a set screw carried by the operating lever Z and adapted to engage the pump piston 'e, and the adjustment of a set screw 1" of the regulating I lever 0, which screw is adapted to engage the 20. valve is delayed relatively to'the stroke of stem of the overflow valve g. By rotating .the eccentric p clockwise on the stud 19 its centerrises and hence the pivotal point of the regulating lever 0 is raised and the screw '1- rises and it takes a longer movement of the lever 0 before the screw rengages the valve stem of the overflow valve 9 and therefore the time of the opening of the overflow the pump piston, as both the levers Z and 0 site takes place as the eccentric is rotated are operated by the rod m; and the oppo counter-clockwise thereby lowering its center and the center of the fulcrum of the lever 0.

The operation of the machine is as follows: During the first stroke only pure air is drawn through the inlet valve 0!. and this is'compressed during the second stroke. At the end of the compression the pump piston e is forced downward, thereby. exerting pressure on the oil in the pump cylinder e and forcing the valve d from. its seat d against the piece 0' which prevents the aperture of the atomizer nozzle .0 being closed, whereby a fine oil mist cone issues from the atomizer nozzle 0, permeates the hot combus tion air, is partially vaporized and intimately mixed with the air. The cylinder head is considerably hotterrthan the cylinder itself and acts somewhat as a vaporizer. The hemispherical combustion chamber which is adapted to theconical form of the fuel issuing fromthe atomizer nozzle and located immediately 'above the engine piston from which projects a cone 8, assists the intense combustion and can readily be freed fromv exhaust gases. When the pump piston has forced-the fuel in the form of a fine mist cone through the atomizer nozzle into the. combustionchamber, the injection ceases I immediatelyso'that the explosion will take place with certainty and exactly at the dead center. In order to attain this result the injectionjof fuel'musfcease suddenly and at l a given moment, and for this reason the pressure is dissipated above the fltOIIllZBI valveby the opening of the overflow valve 9.

the overflow, the-relatively strong spring of the atomizer valve will close the latter and thus prevent the discharge-of further fuel from the atomizer nozzle. When "the ignition has taken place, the expansion takes place during the third stroke and the exhaust during the fourth stroke. Having fully described my invention what I claimv is 1. In an internal combustion engine of the compressed air ignition type, the combi- I nation with the power cylinder of a combustion chamber at the end thereof, an atomizer nozzlearranged to open into thecombustion chamber, a cut-off Valve in the atomizer nozzle, a spring for'normally holding the cut-off valve in closed position, a pump for forcing the liquid fuel through the atomizer nozzle past the cut-off valve, an overflow valve, an operating lever for the pump actuated from the engine shaft, a stud, an eccentric adjustably mounted on the stud, a regulating lever mounted on the eccentric and adapted to control the overflow valve, and a link connecting the regulating lever with the operating lever whereby the pum,

and the overflow valve are operated accor ing to the speed of the engine, substantially pump piston in its upper position, an overflow valve, an operating lever, a set screw on the operating lever andengaging the piston of the pump, an adjustable eccentric, a regulating lever mounted on the eccentric and carrying a set screw for engaging the stem of the'overflow valve,'a link connecting the regulating lever to the operating lever atthesame side of theirpivotal points, and

means for actuating theoperating lever from the engine shaft whereby the pump and the overflow valve are operated according to the speed of the" engine, substantially as described.

'- 3. In an internal combustion engine of the compressed air ignition type, the combination with the power cylinder of a combustion chamber at the end thereof, an atomizer nozzle arranged to open into the combustion chamber, a cut-oif valve in the atomizer nozzle, a spring for normally holding the cut-off valve in closed position, a pump cylinderlconnected with the atomizer nozzle, a piston in the pump cylinder, a spring for holding the pump piston in its retracted pcsition, an overflow valve, a spring for normally holding the overflow valve in'closed jposltion, an operating lever actuated from the engine shaft, adjustable means carried y the operating lever for engaging the pump piston, an adjustable eccentric, a regulating lever mounted on the eccentric, a link connecting the regulating lever with the operating lever, and adjustable means carried by the regulating lever for opening the over- 10 flow valve, substantially as described.

In testnnony whereof I have aflixed my signature in presence of two witnesses.

FRIEDRICH OBERHKNSLI. Witnesses:

EUGENE NABEL,

CARL VEITH. 

